Fault-detecting and corrective apparatus for paper-working machinery.



1 G. B. STILWELL.

PAULT DETECTING AND CORRECTIVE APPARATUS FOR PAPER WORKING MACHINERY.

APPLICATION FILED APR.23.1907,

955,221 A Patented Apr. 19, 1910.

6 SHEETS-SHEET l.

WITNESSES: INVENTOR fl a m fl. 5Z2! 4? A TTORNEY.

0. B. STILWELL.

FAULT DETECTING AND CORRECTIVE APPARATUS FOR PAPER WORKING MACHINERY.

APPLICATION FILED APR. 23, 1907.

955,221. Patented Apr. 19, 1910.

' GSHBETS-SHEET 2. k

4'14 4 TTOR/VEY.

G. B. STILWELL. FAULT DETECTING AND CORRECTIVE APPARATUS FOR PAPERWORKING MACHINERY.

APPLICATION FILED APR.23. 1907.

6 SHEETS-SHEET s.

Patented Apr. 19,

r WAT w W. N U A n H m fl m A Q 4 s. A My W V H & AN \\\\k Y c. B.STILWELL.

FAULT DETECTING AND CORRECTIVE APPARATUS FOR PAPER WORKING MACHINERY.

APPLICATION FILED APR.23.1907

Patented Apr. 19, 1910.

6 SHEETS-SHEET 4.

INVENTUR WI TNESSES 7w wwm er ab 4.2M

A TTOR/VEY.

G. B. STILWELL.

FAULT DETECTING AND CORRECTIVE APPARATUS FOR PAPER WORKING MACHINERY.

APPLICATION FILED APR. 23, 1907.

' Patented Apr. 19, 1 910.

6 SHEETSSHEET 5.

llllllllllllllllll' WI NESSES A TTORNEY.

0. B. STILWELL. v FAULT DETECTING AND CORRECTIVE APPARATUS FOR PAPERWORKING MACHINERY.

APPLICATION FILED APR.28,1907.

Patented Apr. 19, 1910.

6 SHEETS-SHEET 6.

INVENTOR M}! 220 Br M 4 awn/a ATTORNEY.

WITNESSES UNITED sTATEs PATENT oEEIoE.

CHARLES R. STILWELL, or WAYNE, PENNSYLVANIA, ASSIGNOR T0 UNION PAPER BAGMACHINE OOMPANY, 0F PHILADELPHIA, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

FAULT-DETECTING AND CORRECTIVE A P PA'RATUS FOR PAPER-WORKING MACHINERY.

Specification of Letters Tatent.

Patented Apr. 19, 1910.

Application filed April 23, 1907. Serial No. 369,751.

ive Apparatus for Paper-Working Machinery, of which the following is atrue and exact description, reference being had to the accompanyingdrawmgs, which form a part thereof.

My present invention comprises means for automatically detecting faultsin the operation of machines such as paper Working machines, andcorrective mechanism ar-,

ranged to be set in operation by the detecting means on the detection offaults.

Theinvention is primarily intended for use in cbnnection with automaticmachinery for continuously advancing a web of paper,

andhaving means for securing a following web to a preceding Web whennecessary without stopping the machinery, converting the web into acontinuous tube, severing the tube into lengths and converting the tubesinto bags.

As so used, the invention comprises means for detecting faults in theweb of :paper or its feed, faults in the tube and faults in theformation of the bags produced.

It also includes means for stopping the machinery upon the detection offaults in the web or its feed, a breakage of the machine or faults inthe bag formations 0ccur-- ring with a frequency greater than is per-'missible. An important feature of my invention is found in the provisionof means for throwing out an occasional bad bag without stopping themachinery and for stopping the machinery whenever the faulty bagsdetected are numerous enough to eX-' ceed a permissible wastage and tonecessitate a stoppage of the machine for repairs or adjustment.

Another important feature of my invention is the provision of a timingmechanism by which a throw-out mechanism is operated by the faultdetecting apparatus, but after an interval in the operation of themechanism permitting the defective material to be transported from thepoint where the fault is detected to a convenient point for its ejectionfrom the machine. Such a device is particularly advantageousin-connection with that important part of my invention in which Iprovide means for throwing out the portion of the material worked uponcontaining the joint between .two Webs. I have arranged so that thismaterial is thrown out after the tube is formed and severed intolengths, thus obviating any necessity for special severing mechanism andalso avoiding theneoessity for threading the paper through the tubeforming dies which would exist if the joint containing material werethrown out prior to the formation of the tube. At the same time I avoidfeeding this joint containingmaterial through the bag forming mechanismproper where it might injure the folding devices or disturb theiradjustment.

My invention also comprises means for detecting breaks in certain of themachinery parts, especially liable to injury.

The invention also comprises numerous novel features of construction andarrangement.

Whilethe features of invention disclosed herein are primarily intendedfor conjoint use in machinery for forming paper bags, my invention insome of its aspects is capable of a much wider range of use and somefeatures may well be used when desired without a corresponding use ofother features.

In the claims annexed to this specification,

I have aimed to specifically point out all the I to itbag'formationtesters. Fig. 3 is an elevation of the mechanism shown inFig 2. Fig. 4 is a perspective view ofa portion of bag formation contactmechanism. Fig. 5 is an elevation on a larger scale than Fig. 3 of aportion of the mechanism shown therein. Fig. 6 is a plan View of thestructure shown in Fig. 5, with a ortion of the folding bed and adiamond olded blank shown in dotted lines. Fig. 7 is a sectionalelevation taken on the line 77 of Fig. 5. Fig. 8 is a plan view of thetiming device and appurtenant parts used in conjunction with the bagforming mechanism. Fig. 9 is a .side elevation of the mechanism of Fig.8.

-15 is a side elevation of the mechanism shown in Fig. 13. 'Fig. 1G isan elevation taken at right angles to Fig. 14. Fig. 17 is an elevationshowing the means for detecting a broken spring. Fig. 18 is an elevationtaken at right angles to Fig. 17. Fig. 19 is a perspective view of theweb tester. Fig. 20 is a perspective view of the contact actuated by theweb attaching stick of the paper feed mechanism. Fig. 21 is an elevationof the web attaching stick. Fig. 22 is a plan view on a larger scalethan Fig. 8 of a portion of the mechanism shown in Fig. 8, and Fig. 23is an elevation of the mechanism shown in Fig. 22. Fig. 24 is asectional elevation of the means for detecting faults in the tube.

Referring first to Fig. 1 of the drawings, A represents the paperfeeding mechanism, B the tube forming mechanism, and C the bag bottomingmechanism. In the form shown, the tube forming and bag bottomingmechanisms are mounted on a common framework or base. These threeprincipal parts of the mechanism disclosed are driven from a maincountershaft D, which in turn is driven from a shaft D through gears asshown in Fig. 13.

The general operation of the mechanism is as follows: The web E of paperis drawn by the paper feed mechanism around the cylinderA from the rollA or A passing away from the cylinder A over the roll A. Normally thepaper is drawn from the roll A but when the paper upon the roll A isnearly exhausted, the roll A is brought up to speed and the outer end ofthe web forming the roll is cemented onto the paper passing away fromthe roll A'-, which at the same time is severed from the residue of theweb in the roll A The means for cementing the end of the paper formingthe roll A onto the paper which is passing off the roll A, comprises amovable member or stick A see Fig. 20, which is carried by suitablemechanism part way around the cylinder A and is then engaged by theguides A and A and separated from the paper. The roll A is then removedfrom the bearings A" and the roll A is substituted so that thecontinuous web of paper is continuously drawn over the roll A at highspeed. As the exact construction of the paper feed mechanism describedforms no part of the present invention, but on the contrary maybe thatof my latent 808,883, granted Jan uary 21, 1906, no need is seen for'any more detailed description herein of this mechan ism. From the rollA, the paper passes over the bridge rolls A and B to the tube formingmechanism, the paper being printed and having paste applied to it at oradjacent the roll 13*. It is then converted into a bellows sided tube bythe plow or former B and cooperating parts. The tube may have certainlongitudinal cuts formed in it at B and is separated into bag lengths at13. Rolls B B and B carry the bag blanks to the feed rolls C of thebottoming machine from which the blanks pass to the bottom formingcylinder C. The various 0 erations of formlng first the diamond fol sand then the flap folds incident to the formation of a square bottomedbellows sided bag are carried out on the cylinder 0 As the exactconstruction of the tube forming and bag bottoming mechanism form nopart of my present invention, no further general description of thismechanism is thought necessary, especially as the tube forming mechanismso far as is herein described is of a type well known in the art and thebottoming mechanism disclosed forms the subject of my prior applicationfor a patent, Serial Number 354,008, filed January 25th, 1907.

I will now pass to a description of the paper and bag testing mechanismand c0 operative corrective mechanism describing first the partsappurtenant to the paper feed mechanism. 3

The guide A has attached to it two contacts F and F (see Fig. 20.) Thecontact F is rigid and is electrically connected to the framework of themachine. The contact F is insulated from the framework and has a springfinger F normally standing away from the contact F, but pressed intoengagement with the contact F by an arm A" carried by the stick A as thelatter passes into engagement with the guides A" and A As a result, thecontacts F and F are connected whenever'and only when a joint is formedin the web E by lapping the outer end of the web from the roll A ontothe paper which has passed off of the roll A The purpose of the contactsF and F as will be more fully pointed out later, is to cause theejection from the machine of the portion of the web which is defectivebecause of the two thicknesses at the joint.

As shown best in Fig. 19, the roll A is provided with a series ofcircumferentially I extending grooves A. At one side of the roll A islocated a series of pivoted fingers G pivoted on a shaft G eachextending in the plane of a corresponding groove A. Each finger isprovided with a counterweight Gr tending to move the finger into thecorresponding groove A Normally the fingers are held out of the groovesby the presence of the web E of paper between the roll and the fingers.As shown, the brackets G which support the shaft G are insulated fromthe framework of the machine A on which they are mounted. \Vhen the webof paper has holes in it or is less than the proper width or islaterally displaced from its proper position on the roll A, the fingers,or some of them. contact the roll A and thus connect the shaft Gelectrically to the framework. When a hole passes under a finger G thefinger is drawn through the paper in the proper groove G the groovesthus make the action of the fingers more positive.

In the formation of the tube, a portion of the webpasses under a metalguide-bar B secured to and forming an extension of the plow 13*. Springfingers H insulated from the framework of the mechanism tend to pressagainst the bar B- being normally held out of engagement therewith bythe paper.

Should the tube break or the tube have holes in its under sideundetected by the fingers G or occurring after the paper has passed bythe fingers G, such fault will be detected by the fingers H, moving intoelectrical contact with the bar B A switch or shunting device I iscarried by arms I located at each end of the lower roll B and journaledon the shaft supporting the roll. One of the arms I is joined to one armof a bell-crank lever I to the other arm of which is connected a link I\Vhen the link I is pulled down, the switch I is moved from the positionshown in Fig. 1, in which it permits the bag blanks to pass to thebottoming mechanism intothe position in which it deflects the bag blanksdownward along the lower roll B thus diverting them from the bottomingmechanism. The switch I is controlled by the timing device J, see Figs.14, 15, and 16, which includes a rotatin disk or cylinder J which isdriven at the esired speed from the shaft D. The disk has formed in itadjacent its periphery a number of axially extending pockets or passagesin which are located sliding pins J 2 which normally project from theends of the cylinder J, as shown in Figs 14 and 15. At one side of thedisk J is located an electroinagnet J the movable armature J of J andridin the pin J then in front of it when the armature is energized. Thepin engaged by the finger J 7 when the magnet J 3 is energized, is.

moved axially in its passage in the disk J As shown, the finger J 7 ispivoted to the arm J so that it may yield when engaged by a pin or pinsJ 2 above the one which it has displaced in the disk. A spring J 9normally holds the finger in the operative position. The lower end ofthe link I is pivotally connected to one arm J of a bell-crank leverpivoted to the framework of the machine at J. The other arm J of thebellcrank lever is acted upon by a spring J tending to move the link Iin the direction to divert blanks away from the bottoming mechanism.This movement is normally prevented by a lug J carried by the lever onthe outer surfaces of the adjacent pro ecting ends of the pins J When apin, axially displaced by the finger J 7 travels around to the positionbeneath the lug J the arm J drops and-the deflector I is raised and ablank 15 diverted from the bottoming mechanism. A cam J acts to returnany displaced pins to the normal position as they travel away from theposition where they engage the lug J. The ener gization of the magnet J3 is controlled by the contacts F and F and the parts are so timed thatthe bag blank containing the lap or joint is thrown out by the deflectorI when it reaches the rolls B The bag formation testers are in the formshown applied tothe revolving device K, employed for applying paste tothe bottom of the bag after it has been diamond folded, and preparatoryto the flap folding. These detectors comprise sliding fingers or pins Kand K and resilient fingers K". The sliding fingers K and K are allradial and are normally held by springs K so that their inner ends areout of engagement'with the spring contact fingers K secured to arms K ofa bracket K secured to but insulated from the framework of the member K.It should be explained that in the form shown the member K is providedwith two sets of pasting devices and detectors, each set workingalternately. The outer ends of the pins K and K normally enterdepressions K and K", respectively, (see Fig. 2) formed for the purposein the cylinder C at the margins R of the diamond folded blank R (seeFig. 6), when itis properly formed and consequently the diamond foldlines are properly positioned on the folding cylinder. Any fault in theformation of the diamond folds resulting in a portion of the paper beingextended over one or more of the depressions K and K in the foldingcylinder causes the corresponding pin or pins K or K to be pressedlaterally inward and engage the corresponding spring contact 01'contacts K. The spring fingers K are so positioned that they normallyengage the extreme for ward end of the folded blank, but if this is backof the proper position they engage the folding cylinder and makeelectrical contact therewith. The pins K and K are electricallyconnected to the framework of the machine by means of the brackets K, inwhich they are supported. The fingers K are insulated from the frameworkK. The lingers K and contact supporting brackets IV are connected byconductors K, insulated from the framework of the machine, to slip-ringsK secured on, but insulated from, the shaft which carries the pastingmechanism K.

In normal operation, the bags formed on the folding cylinders C aredelivered to the receiving mechanism formed by the rolls C" and C. Incooperative relation to the lower roll C is located a shunting device orswitch L, which may be similar to the switch I, and be operated in asimilar manner through a'lever L by the link L connected to a timingdevice M generally similar to the timing device J, but differing in someparticulars. As shown, the timing mechanism- M comprises parts M M M M MM, M, M, M M, M M M, M and M generally similar to the parts J to J,respectively, although the magnet and parts connected with it aresomewhat differently disposed. The operation of the device M is likethat of the throw-out J in that whenever the magnet M is energized and apin M laterally displaced, the deflector L is operated to divert a bagat the proper time from its usual course. The displaced pins in thethrow-out M perform an additional function, however, which I will nowdescribe.

On the opposite side of the disk M from that to which the lever M isarranged, is located a plate N, having a stud N on which is journaled anarm N having two pin engaging teeth N and N". A washer N bearing againstthe arm N and pressin it against a boss N 6 concentric with the stud Nin conjunction with the spring N forms a frictional clamp acting to holdthe arm N in any position in which it may be moved. The arm I alsocarries a pin or stud N adapted to beengaged by a finger N car ried byan arm N mounted on and held against turning by means of a stud N washerN boss N and spring N similar to the parts N N, N and N previouslydescribed. The arm N has a lug N adapted to be engaged by a displacedpin. The arms N and N are located at one side of the normal position ofthe pins M but so that they will be engaged by pins which have beendisplaced by the striker M The normal condition of the apparatus isshown in Fig. 23 A pin, laterally displaced by the tapper M engages thetooth M and swings the arm N into the dotted position indicated at N inFig. 23, whereupon the pin passes out from under the tooth. In thisposition of the arm N the tooth N is in position to be engaged by adisplaced pin, should another pin be displaced before the arm N has beenreturned to its original position, such a second displaced pin engagingthe tooth N carries the arm over into the second dotted positionindicated at N, in which position it en ages with the insulated springcontact finger N carried by the plate N, and the circuit thus closedstops the machine in a manner hereinafter explained. In case a secondpin is not displaced until the pin which has carried the arm N from thefullline position to the dotted line position N has moved intoengagement with the cam lug N on the arm N, such engagement causes thearm N to be returned into its original position from the dotted lineposition into which it has been carried by the pin N on the arm N Thereturning movement of the arm N to its full line position of coursecarries the arm N back to its full line position. It will be observedthat an occasional bad bag will be thrown out by the mechanism describedwithout stopping the machine, but the detection of a second bad bagwhile the pin displaced by a first bad bag is traveling from the pointat which it reaches a tooth N to the position in which it engages thelug N will stop the machine, and of course the maximum percentage of badbags in a predetermined number of successively formed bags which may beallowed to pass without stopping the machine may be varied by changingthe number of pins M and the location of the arms N and N".

The mechanism shown for stopping the machine includes a clutch O forconnecting the shaft D to its driver, which may be a belt-driven pulleyor the like. The clutch is operated'by a clutch lever O pivotallyconnected to the framework of the machine at O and at its other end toan operating bar 0 As clutch mechanisms of this character arewell-known, I have not thought it necessary to illustrate the exactconstruction of the parts and will only describe the operating featurespeculiar to my invention. The operating bar is connected at one end toan operating hand lever O for manual actuation. It also has connected toit a lever O ivoted to the framework of the machine at The lever O hasformed in it a bearing for a sliding pin 0 which is located below andnormally out of engagement with a screw cam D secured to the shaft D Theelectro-magnet O has a pivoted armature 0 provided with an extension 0which moves an arm 0 and thereby lifts the pin 0 into the position inwhich the upper end of the pin engages the screw cam D whenever themagnet O is energized. The engagement of the pin O with the camD causesthe lever O to be turned on its pivot and move the operating bar 0 torelease the clutch and stop the machine.

The lever O carries a bridge contact 0 which is adapted to connectcontacts P and ]E when the clutch is in the operative position, anddisconnect these contacts when the clutch is released. i

The stationary. arm J to which one end of the spring J is connected, hasa spring engaging hook J 17 and an insulated bracket J provided withpins J located one above and one below the hook J 17 when thdatter is inits normal position. These pins are engaged by the hook when'it flies upor down on a breaka e of the spring J. The hook J is groun ed to theframework of the machine and therefore when it engages either pin J itestablishes electrical connection between the framework of the machineand the insulated bracket J, and such a construction may be employedwherever the detection of a broken spring is desirable, as in the timingdevice M where the parts M", M, M and 1\ correspond to the parts I, I, Iand 1 respectively.

The electrical connections are as follows: A conductor 1 connects thecontact P to the machine framework. A conductor 2 runs from the contactP to one side of the battery or other source of current 3. The otherside of the source of current 3 is connected to a conductor 1, fromwhich branches 5, 6 and 7 run to one terminal of each of the magnets -OJ and M respectively. The second terminal of magnet M is connected by aconductor 8 to the brushes K engaging slip'-rings I The second terminalof magnet J 3 is connected by a conductor 9 to the contact F, ofthefeeding mechanism. A conductor 10 running from the second terminal ofthe stop magnet O to one set of terminals of three electrical indicatorsQ}, Q and Q mounted on a board Q. The winding of indicator Q connectsthe conductor 10 and a conductor 11 running to the contact N of thetiming device M. The.

winding of the indicator Q connects the conductor 10 and a conductor 12connected to the pipe or tube contact fingers H. The winding of thethird indicator Q? connects the conductor 10 and a conductor 13 runningto the insulated spring engaging hook J of the device J. It will beunderstood that in practice the. conductor 13 is also connected to theinsulated hook M of the device M, though to avoid complicating thedrawings this connection has not been shown in Fig. 1. A branchconductor 14 from the conductor 12 is connected to the web testingfingers G. A conductor 15 connects the conductor 10 to a push button Rso that the operation of the latter will cause the magnet O to beenergized and thereby stop the machinery.

The general operation of my invention will be readily understood fromthe forego ing without any explanation, though attention is directed tothe fact that an occasional fault in a bag detected by the bag formationtesting devices results merely in an opera{ .or its alinement on theroll A detected by the fingers G will also stop the machine and theindicator Q will show that fault was detected in the tube or web. Itwould, of course, be easy to provide aseparate indicator for the fingersG and fingers H, but in actual practice I have not found such refinementnecessary. A breakage of, the springs J or M will also result in thestopping of the entire machinery, and the indicator Q will show that thefault is in the springs and not in the paper feed, tube formmg orbottoming mechanism.

While the forms of my invention disclosed herein have been found to givesatisfactory results, it will be readily understood by those skilled inthe art that my invention may be embodied in many diiferentforms withoutdeparting from the spirit of my invention.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is,

1. The combination in a bag machine, of bag folding mechanism, baformation testers for detecting a badly formed bag, and correctivemechanism automatically actuated through said testers on the detectionthereby of a badly formed bag.

2. The combination in a bag machine, of bag folding mechanism, baformation testers for detectin rective mechanism automatically actuatedthrough said testers on the detection thereby of a badly formed bag, andmeans actuated by a breakdown of said mechanism for stopping themachine.

3. The combination in a bag machine, of bag folding mechanism, bagformation testers" for detecting a badly formed bag, and mech anismautomatically actuated through said testers on the detection thereby ofa badly formed bag for throwing out such bag.

4. In a machine, automatic fault detecting means, corrective mechanismand means for a badly ormed bag, 0017- I actuating said mechanism aftera predetermined interval following the detection of a fault by saiddetecting means, the actuating means including a wheel revolving infixed relation to the speed of the machine, a series of pins movablysupported thereby, means actuated by the fault detecting means fordisplacing a pin and means actuated by a displaced pin for operating thecorrective mechanism.

5. In a paper working machine, means for detecting faults in the paperworked and mechanism for throwing out the defective paper after apredetermined interval following the detection of the fault, saidmechanism comprising a rotating disk and a series of pins movablysupported thereby, means actuated by the fault detecting means fordisplacing a pin upon the detection of a fault, and a-shunting deviceactuated by a displaced pin for throwing out defective paper at theproper time.

6. In a bag forming machine, stop actuating mechanism including amovable mem-- ber, means for detecting a fault in the formation of abag, means actuated thereby upon the detection of a fault for movingsaid movable member from a normal position to an intermediate, butnon-stop-actuating position, means for returning the member from theintermediate position to the normal position after the formation of apredetermined number of bags following the faulty bag without thedetection of a faulty bag, and means for moving said member from theintermediate position to a second and stop actuating position upon thedetection of faults in any of said predetermined number of bags.

7. In a bag machine, mechanism for successively diamond folding a blank,flap folding it and delivering it to receiving mechanism, means fordetecting faults in the diamond folding and means actuated by thedetectin'g means for diverting from the receivmg means an improperlydiamond folded blank after it has been acted upon by the flap foldingmechanism.

8. In a bag machine, a folding bed, means for forming the diamond foldsin a tubular bag blank supported on said folding bed and means fordetecting faults in the folding operation comprising fingers arranged tobe displaced by an impro er location of the fold lines relative to theolding bed.

9. In a bag machine, a rotating folding bed, means for formin thediamond folds in a tubular bag blanli supported on said bed, a devicerotating above the bed detectors carried by said device and arranged tobe displayed by an improper disposition of the diamond fold linesrelative to said bed.

10. In a bag machine, a carrier for advancing a diamond folded blank andmeans for detecting an improper disposition of the diamond fold linesrelative to the carrier.

11. In a bag machine, a carrier for advancing a diamond folded blank andmeans for detecting an improper disposition of the diamond fold linesrelative to the carrier,

said means including circuit closing devices actuated by improperlyplaced blank portions.

12. In a bag machine, a rotating folding cylinder, means for diamondfolding a tubular bag blank thereon, a device rotating above the bed,and circuit closing mechanism carried by said device, comprising fingersrendered operative to close a circuit or circuits by an improperdisposition of the blank on the cylinder.

13. In a bag machine, a rotating folding cylinder, mechanism for firstdiamond foldin and thenfiap folding a bag blank on sa1d cylinder, arevolving paster for applying paste to the blank after the formation ofthe diamond folds, and prior to the formation of the flap folds andmeans carried by the paster for detecting faults in the diamond foldedblank.

14. In a paper working machine, mechanism for advancing a web of paper,a throw-out mechanism, and means automatically responsive to the passagethrough the machine of a jointed portion of said web for actuating saidthrow-out mechanism to throw out said jointed web portion.

15. In a paper working machine, means for advancing a web of paper,means for attaching a second web to the preceding web without stoppingthe machine, and means for thereafter automatically throwing out theportion of the paper containing the web joint.

16. In combination, mechanism for continuously advancing a web of paper,converting it into short tubes and delivering the tubes to a receivingmechanism, means for attaching a following web to a preceding webWithout stopping the operation of the' first mentioned mechanism andmeans for diverting tubes containing web joints from the receivingmechanism.

17. In combination, mechanism for continuously advancing a web of paper,converting it into short tubes and delivering the tubes to a receivingmechanism, means for attaching a following web to a preceding webwithout stopping the operation of the first mentioned mechanism andmeans for diverting tubes containing web joints from the receivingmechanism, said means being set in operation automatically.

18. In combination, mechanism for 00.1- tinuously advancing a web of paer, converting it into short tubes and d eliver ug the tubes to areceiving mechanism, means for attaching a following web to a prec ingweb without stopping the operation of the first mentioned mechanism andmeans for diverting tubes containing web joints from the receivingmechanism, said meanscomprising electrical devices energized by theoperation of the web attaching mechanism.

19. A safety appliance for a machine having a tension spring comprisinga pivotally supported hook to which one end of the spring is connected,and means for stopping the machine actuated by a displacement of thehook resulting from the breaking of the spring.

20. A safety appliance for a machinehaving a spring, comprising amovable support for the spring and means for stopping the machineresponsive to the change of osition of the movable support, resultingfrom a breakage of the spring attached to it.

21. In combination, a web feeding mechanism, mechanism for convertingthe web into a tube and severing it into lengths mechanism forconverting the severed tubes into bags, means for stopping all of saidmechanisms, means for automatically detecting faults in the web, meahsfor automatically detecting faults in the tubes, means for automaticallydetecting faults in the bags formed and operative connections betweeneach of said detecting means and the stopping means.

22. In a paper working machine, means for advancing a web of aper,converting it into a tube and forming ags from the tube, means fordetecting faults in the bags formed, means for detecting faults in thepaper prior to the formation of the bags, a

common stop mechanism actuated by each of said detecting means, andindicators for showing which set of detecting means has actuated thestop mechanism.

23. In a paper working machine, means for continuousl advancing thepaper, means for detectlng faults in the advancing paper at one oint inthe travel of the pa per,-a shunting device for faulty paper located ata later point in the travel of the paper and actuatlng means for theshunt set in operation by the detecting means on the detection of afault, said actuating means including a timing device to delay theoperation of the shunt until the faulty material has traveled from thepoint of detection to the point where the shunt is located.

CHARLES B. STILWELL. Witnesses:

ARNOLD KATZ, D, STEWART.

